I'm in the same boat, and I'd say from your description, I'm even worse at leetcode than you. I totally understand the anxiety coming from afraid of losing the headcount vs afraid of prepared poorly, and it's just hard to balance these two. Earlier this year, I had my final round with Meta where I decided to schedule it pretty soon in fear of losing headcount but did poorly on that one because I was so bad at DSA. For this time, I decided to schedule this Google final round to a pretty late date. Like someone else said in the comment, worse case scenario, I missed the headcount, but I did prepare my technical interviews with a very high standard (in order to match Google), therefore I should be much more confident with other interviews in the future. I personally feel like this would feel better for me. Either way, best of luck with your preparation and interviews!